Refrigeration Maintenance and Service Operations
146
Dehumidify Valve Replacement
Removal
1. Close the liquid line service valve and pump
down the low side to -35 kPa, -0.35 bar, 10 in.
vacuum. Break the vacuum with nitrogen
between 10 and 20 kPa, 0.10 and 0.20 bar, 1
and 3 psig.
2. Remove insulating tape from liquid line.
3. Disconnect the electrical connections to the
dehumidify valve.
NOTE: In most cases, only the coil requires
replacement. No other repair is possible on
the liquid injection valve.
4. Unsolder the liquid line connections.
5. Unbolt and remove the valve from the unit.
Installation
1. Clean the tubes for soldering.
2. Place the new valve in position.
3. Solder the liquid line connections.
4. Pressurize the low side with refrigerant and
check for leaks (see “Refrigerant Leak Test
Procedure” in this chapter).
5. If no leaks are found, recover the leak test gas
(see “Refrigerant Recovery” in this chapter).
6. Evacuate the low side (see “Evacuation and
Cleanup of the Refrigeration System” in this
chapter).
7. Cover liquid lines with insulating tape.
8. Reconnect the electrical wires to the valve.
9. Open the liquid line service valve and place
the unit in operation. Check the refrigerant
charge and add refrigerant as required.
CAUTION: Use a heat sink or wrap the
valve with wet rags to prevent damage to
the new valve.
Содержание CRR-40 119
Страница 4: ......
Страница 16: ...Safety Precautions 16...
Страница 18: ...Service Guide 18...
Страница 20: ...Model Features 20...
Страница 32: ...Specifications 32...
Страница 120: ...MP 3000a Controller 120...
Страница 160: ...Wiring and Schematic Diagrams Index 160...
Страница 161: ...161 MPC2000 Wiring Schematic...
Страница 162: ...162 MPC2000 High Voltage Wiring Diagram...
Страница 163: ...163 MPC2000 Low Voltage Wiring Diagram...
Страница 164: ...164 MPC2000 WCC Wiring Schematic...